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BEAMER, WILSON C.; PROUGH, DONALD S.; ROYSTER, ROGER L.; JOHNSTON, WILLIAM E.; JOHNSON, J. CARSON . (1984). High-frequency jet ventilation produces auto-PEEP. Critical Care Medicine, 12(9), 734–737. doi:10.1097/00003246-198409000-00010 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research